Adding demo for 32L152CDISCOVERY.

This board contains a STM32L152RCT6 (256 KB Flash, 32 KB RAM).

This commit contains pretty much a copy, paste, replace of the
following:
    ./demos/ARMCM3-STM32L152-DISCOVERY
    ./boards/ST_STM32L_DISCOVERY
    ./os/ports/GCC/ARMCMx/STM32L1xx/ld/STM32L152xB.ld

IDE files have not been copied (.cproject, .project, iar, keil)
as while its likely a simple find and replace I wouldn't have been able to
test them.

*** ChibiOS/RT test suite
***
*** Kernel:       2.6.2
*** Compiled:     Nov 17 2013 - 23:18:12
*** Compiler:     GCC 4.7.4 20130913 (release) [ARM/embedded-4_7-branch revision 202601]
*** Architecture: ARMv7-M
*** Core Variant: Cortex-M3
*** Port Info:    Advanced kernel mode
*** Platform:     STM32L1xx Ultra Low Power Medium Density
*** Test Board:   ST 32L152CDISCOVERY

----------------------------------------------------------------------------
--- Test Case 1.1 (Threads, enqueuing test #1)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 1.2 (Threads, enqueuing test #2)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 1.3 (Threads, priority change)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 1.4 (Threads, delays)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 2.1 (Semaphores, enqueuing)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 2.2 (Semaphores, timeout)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 2.3 (Semaphores, atomic signal-wait)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 2.4 (Binary Semaphores, functionality)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 3.1 (Mutexes, priority enqueuing test)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 3.2 (Mutexes, priority inheritance, simple case)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 3.3 (Mutexes, priority inheritance, complex case)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 3.4 (Mutexes, priority return)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 3.5 (Mutexes, status)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 3.6 (CondVar, signal test)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 3.7 (CondVar, broadcast test)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 3.8 (CondVar, boost test)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 4.1 (Messages, loop)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 5.1 (Mailboxes, queuing and timeouts)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 6.1 (Events, registration and dispatch)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 6.2 (Events, wait and broadcast)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 6.3 (Events, timeouts)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 7.1 (Heap, allocation and fragmentation test)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 8.1 (Memory Pools, queue/dequeue)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 9.1 (Dynamic APIs, threads creation from heap)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 9.2 (Dynamic APIs, threads creation from memory pool)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 9.3 (Dynamic APIs, registry and references)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 10.1 (Queues, input queues)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 10.2 (Queues, output queues)
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.1 (Benchmark, messages #1)
--- Score : 129464 msgs/S, 258928 ctxswc/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.2 (Benchmark, messages #2)
--- Score : 104764 msgs/S, 209528 ctxswc/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.3 (Benchmark, messages #3)
--- Score : 104764 msgs/S, 209528 ctxswc/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.4 (Benchmark, context switch)
--- Score : 441584 ctxswc/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.5 (Benchmark, threads, full cycle)
--- Score : 77309 threads/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.6 (Benchmark, threads, create only)
--- Score : 109831 threads/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.7 (Benchmark, mass reschedule, 5 threads)
--- Score : 32901 reschedules/S, 197406 ctxswc/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.8 (Benchmark, round robin context switching)
--- Score : 231620 ctxswc/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.9 (Benchmark, I/O Queues throughput)
--- Score : 335444 bytes/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.10 (Benchmark, virtual timers set/reset)
--- Score : 348084 timers/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.11 (Benchmark, semaphores wait/signal)
--- Score : 461544 wait+signal/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.12 (Benchmark, mutexes lock/unlock)
--- Score : 297652 lock+unlock/S
--- Result: SUCCESS
----------------------------------------------------------------------------
--- Test Case 11.13 (Benchmark, RAM footprint)
--- System: 404 bytes
--- Thread: 72 bytes
--- Timer : 20 bytes
--- Semaph: 12 bytes
--- EventS: 4 bytes
--- EventL: 16 bytes
--- Mutex : 16 bytes
--- CondV.: 8 bytes
--- Queue : 36 bytes
--- MailB.: 40 bytes
--- Result: SUCCESS
----------------------------------------------------------------------------

Final result: SUCCESS